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EST_strcasecmp.c
1 /*
2  * Copyright (c) 1987, 1993
3  * The Regents of the University of California. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
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8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
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12  * documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  * must display the following acknowledgement:
15  * This product includes software developed by the University of
16  * California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  * may be used to endorse or promote products derived from this software
19  * without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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33 
34 /*
35  * Modified by RJC to have a new name and to take the collation
36  * table as an optional argument.
37  */
38 
39 #include "EST_strcasecmp.h"
40 
41 #if defined(LIBC_SCCS) && !defined(lint)
42 static char sccsid[] = "@(#)strcasecmp.c 8.1 (Berkeley) 6/4/93";
43 #endif /* LIBC_SCCS and not lint */
44 
45 
46 /*
47  * This array is designed for mapping upper and lower case letter
48  * together for a case independent comparison. The mappings are
49  * based upon ascii character sequences.
50  */
51 static const unsigned char def_charmap[] = {
52  0, 1, 2, 3, 4, 5, 6, 7,
53  8, 9, 10, 11, 12, 13, 14, 15,
54  16, 17, 18, 19, 20, 21, 22, 23,
55  24, 25, 26, 27, 28, 29, 30, 31,
56  32, 33, 34, 35, 36, 37, 38, 39,
57  40, 41, 42, 43, 44, 45, 46, 47,
58  48, 49, 50, 51, 52, 53, 54, 55,
59  56, 57, 58, 59, 60, 61, 62, 63,
60  64, 97, 98, 99, 100, 101, 102, 103,
61  104, 105, 106, 107, 108, 109, 110, 111,
62  112, 113, 114, 115, 116, 117, 118, 119,
63  120, 121, 122, 91, 92, 93, 94, 95,
64  96, 97, 98, 99, 100, 101, 102, 103,
65  104, 105, 106, 107, 108, 109, 110, 111,
66  112, 113, 114, 115, 116, 117, 118, 119,
67  120, 121, 122, 123, 124, 125, 126, 127,
68  128, 129, 130, 131, 132, 133, 134, 135,
69  136, 137, 138, 139, 140, 141, 142, 143,
70  144, 145, 146, 147, 148, 149, 150, 151,
71  152, 153, 154, 155, 156, 157, 158, 159,
72  160, 161, 162, 163, 164, 165, 166, 167,
73  168, 169, 170, 171, 172, 173, 174, 175,
74  176, 177, 178, 179, 180, 181, 182, 183,
75  184, 185, 186, 187, 188, 189, 190, 191,
76  192, 193, 194, 195, 196, 197, 198, 199,
77  200, 201, 202, 203, 204, 205, 206, 207,
78  208, 209, 210, 211, 212, 213, 214, 215,
79  216, 217, 218, 219, 220, 221, 222, 223,
80  224, 225, 226, 227, 228, 229, 230, 231,
81  232, 233, 234, 235, 236, 237, 238, 239,
82  240, 241, 242, 243, 244, 245, 246, 247,
83  248, 249, 250, 251, 252, 253, 254, 255,
84 };
85 
86 int
87 EST_strcasecmp(const char *s1, const char *s2, const unsigned char *charmap)
88 {
89  register const unsigned char *cm = charmap?charmap:def_charmap,
90  *us1 = (const unsigned char *)s1,
91  *us2 = (const unsigned char *)s2;
92  int r;
93 
94  while (cm[*us1] == cm[*us2++])
95  if (*us1++ == '\0')
96  return (0);
97  r = (cm[*us1] - cm[*--us2]);
98  return r;
99 }
100 
101 int
102 EST_strncasecmp(const char *s1, const char *s2, size_t n, const unsigned char *charmap)
103 {
104  if (n != 0) {
105  register const unsigned char *cm = charmap?charmap:def_charmap,
106  *us1 = (const unsigned char *)s1,
107  *us2 = (const unsigned char *)s2;
108 
109  do {
110  if (cm[*us1] != cm[*us2++])
111  return (cm[*us1] - cm[*--us2]);
112  if (*us1++ == '\0')
113  break;
114  } while (--n != 0);
115  }
116  return (0);
117 }